Hydrangeas: If your blue Hydrangeas turn out pink..., 0 by wallaby1

wallaby1 wrote:
I have heard of aluminium making the difference, I must be lucky as I have H. Mariesii which remains a light blue, and an unknown name I bought as a larger plant but it's been in the ground for 5 years and remains blue, but I have notice a purple tinge coming in. It will still have it's main root ball in the original compost, which is mostly peat and useless to any long living plant. I mostly rip as much off as I can now, some plants will die after a time in that, but if they have rerooted into soil just above on the stem they will grow on.